2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #include "libavutil/log.h"
22 #include "libavutil/mem.h"
23 #include "libavutil/opt.h"
24 #include "libavutil/avstring.h"
25 #include "libavutil/bprint.h"
30 struct AVBSFInternal {
35 void av_bsf_free(AVBSFContext **pctx)
43 if (ctx->filter->close)
44 ctx->filter->close(ctx);
45 if (ctx->filter->priv_class && ctx->priv_data)
46 av_opt_free(ctx->priv_data);
50 av_packet_free(&ctx->internal->buffer_pkt);
51 av_freep(&ctx->internal);
52 av_freep(&ctx->priv_data);
54 avcodec_parameters_free(&ctx->par_in);
55 avcodec_parameters_free(&ctx->par_out);
60 static void *bsf_child_next(void *obj, void *prev)
62 AVBSFContext *ctx = obj;
63 if (!prev && ctx->filter->priv_class)
64 return ctx->priv_data;
68 static const AVClass bsf_class = {
69 .class_name = "AVBSFContext",
70 .item_name = av_default_item_name,
71 .version = LIBAVUTIL_VERSION_INT,
72 .child_next = bsf_child_next,
73 .child_class_next = ff_bsf_child_class_next,
76 const AVClass *av_bsf_get_class(void)
81 int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **pctx)
86 ctx = av_mallocz(sizeof(*ctx));
88 return AVERROR(ENOMEM);
90 ctx->av_class = &bsf_class;
93 ctx->par_in = avcodec_parameters_alloc();
94 ctx->par_out = avcodec_parameters_alloc();
95 if (!ctx->par_in || !ctx->par_out) {
96 ret = AVERROR(ENOMEM);
100 ctx->internal = av_mallocz(sizeof(*ctx->internal));
101 if (!ctx->internal) {
102 ret = AVERROR(ENOMEM);
106 ctx->internal->buffer_pkt = av_packet_alloc();
107 if (!ctx->internal->buffer_pkt) {
108 ret = AVERROR(ENOMEM);
112 av_opt_set_defaults(ctx);
114 /* allocate priv data and init private options */
115 if (filter->priv_data_size) {
116 ctx->priv_data = av_mallocz(filter->priv_data_size);
117 if (!ctx->priv_data) {
118 ret = AVERROR(ENOMEM);
121 if (filter->priv_class) {
122 *(const AVClass **)ctx->priv_data = filter->priv_class;
123 av_opt_set_defaults(ctx->priv_data);
134 int av_bsf_init(AVBSFContext *ctx)
138 /* check that the codec is supported */
139 if (ctx->filter->codec_ids) {
140 for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++)
141 if (ctx->par_in->codec_id == ctx->filter->codec_ids[i])
143 if (ctx->filter->codec_ids[i] == AV_CODEC_ID_NONE) {
144 const AVCodecDescriptor *desc = avcodec_descriptor_get(ctx->par_in->codec_id);
145 av_log(ctx, AV_LOG_ERROR, "Codec '%s' (%d) is not supported by the "
146 "bitstream filter '%s'. Supported codecs are: ",
147 desc ? desc->name : "unknown", ctx->par_in->codec_id, ctx->filter->name);
148 for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++) {
149 desc = avcodec_descriptor_get(ctx->filter->codec_ids[i]);
150 av_log(ctx, AV_LOG_ERROR, "%s (%d) ",
151 desc ? desc->name : "unknown", ctx->filter->codec_ids[i]);
153 av_log(ctx, AV_LOG_ERROR, "\n");
154 return AVERROR(EINVAL);
158 /* initialize output parameters to be the same as input
159 * init below might overwrite that */
160 ret = avcodec_parameters_copy(ctx->par_out, ctx->par_in);
164 ctx->time_base_out = ctx->time_base_in;
166 if (ctx->filter->init) {
167 ret = ctx->filter->init(ctx);
175 int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt)
177 if (!pkt || (!pkt->data && !pkt->side_data_elems)) {
178 ctx->internal->eof = 1;
182 if (ctx->internal->eof) {
183 av_log(ctx, AV_LOG_ERROR, "A non-NULL packet sent after an EOF.\n");
184 return AVERROR(EINVAL);
187 if (ctx->internal->buffer_pkt->data ||
188 ctx->internal->buffer_pkt->side_data_elems)
189 return AVERROR(EAGAIN);
191 av_packet_move_ref(ctx->internal->buffer_pkt, pkt);
196 int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt)
198 return ctx->filter->filter(ctx, pkt);
201 int ff_bsf_get_packet(AVBSFContext *ctx, AVPacket **pkt)
203 AVBSFInternal *in = ctx->internal;
209 if (!ctx->internal->buffer_pkt->data &&
210 !ctx->internal->buffer_pkt->side_data_elems)
211 return AVERROR(EAGAIN);
213 tmp_pkt = av_packet_alloc();
215 return AVERROR(ENOMEM);
217 *pkt = ctx->internal->buffer_pkt;
218 ctx->internal->buffer_pkt = tmp_pkt;
223 int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
225 AVBSFInternal *in = ctx->internal;
230 if (!ctx->internal->buffer_pkt->data &&
231 !ctx->internal->buffer_pkt->side_data_elems)
232 return AVERROR(EAGAIN);
234 av_packet_move_ref(pkt, ctx->internal->buffer_pkt);
239 typedef struct BSFListContext {
240 const AVClass *class;
245 unsigned idx; // index of currently processed BSF
246 unsigned flushed_idx; // index of BSF being flushed
252 static int bsf_list_init(AVBSFContext *bsf)
254 BSFListContext *lst = bsf->priv_data;
256 const AVCodecParameters *cod_par = bsf->par_in;
257 AVRational tb = bsf->time_base_in;
259 for (i = 0; i < lst->nb_bsfs; ++i) {
260 ret = avcodec_parameters_copy(lst->bsfs[i]->par_in, cod_par);
264 lst->bsfs[i]->time_base_in = tb;
266 ret = av_bsf_init(lst->bsfs[i]);
270 cod_par = lst->bsfs[i]->par_out;
271 tb = lst->bsfs[i]->time_base_out;
274 bsf->time_base_out = tb;
275 ret = avcodec_parameters_copy(bsf->par_out, cod_par);
281 static int bsf_list_filter(AVBSFContext *bsf, AVPacket *out)
283 BSFListContext *lst = bsf->priv_data;
287 return ff_bsf_get_packet_ref(bsf, out);
290 if (lst->idx > lst->flushed_idx) {
291 ret = av_bsf_receive_packet(lst->bsfs[lst->idx-1], out);
292 if (ret == AVERROR(EAGAIN)) {
293 /* no more packets from idx-1, try with previous */
297 } else if (ret == AVERROR_EOF) {
298 /* filter idx-1 is done, continue with idx...nb_bsfs */
299 lst->flushed_idx = lst->idx;
302 /* filtering error */
306 ret = ff_bsf_get_packet_ref(bsf, out);
307 if (ret == AVERROR_EOF) {
308 lst->idx = lst->flushed_idx;
313 if (lst->idx < lst->nb_bsfs) {
315 if (ret == AVERROR_EOF && lst->idx == lst->flushed_idx) {
316 /* ff_bsf_get_packet_ref returned EOF and idx is first
317 * filter of yet not flushed filter chain */
322 ret = av_bsf_send_packet(lst->bsfs[lst->idx], pkt);
327 /* The end of filter chain, break to return result */
333 av_packet_unref(out);
338 static void bsf_list_close(AVBSFContext *bsf)
340 BSFListContext *lst = bsf->priv_data;
343 for (i = 0; i < lst->nb_bsfs; ++i)
344 av_bsf_free(&lst->bsfs[i]);
345 av_freep(&lst->bsfs);
346 av_freep(&lst->item_name);
349 static const char *bsf_list_item_name(void *ctx)
351 static const char *null_filter_name = "null";
352 AVBSFContext *bsf_ctx = ctx;
353 BSFListContext *lst = bsf_ctx->priv_data;
356 return null_filter_name;
358 if (!lst->item_name) {
361 av_bprint_init(&bp, 16, 128);
363 av_bprintf(&bp, "bsf_list(");
364 for (i = 0; i < lst->nb_bsfs; i++)
365 av_bprintf(&bp, i ? ",%s" : "%s", lst->bsfs[i]->filter->name);
366 av_bprintf(&bp, ")");
368 av_bprint_finalize(&bp, &lst->item_name);
371 return lst->item_name;
374 static const AVClass bsf_list_class = {
375 .class_name = "bsf_list",
376 .item_name = bsf_list_item_name,
377 .version = LIBAVUTIL_VERSION_INT,
380 const AVBitStreamFilter ff_list_bsf = {
382 .priv_data_size = sizeof(BSFListContext),
383 .priv_class = &bsf_list_class,
384 .init = bsf_list_init,
385 .filter = bsf_list_filter,
386 .close = bsf_list_close,
394 AVBSFList *av_bsf_list_alloc(void)
396 return av_mallocz(sizeof(AVBSFList));
399 void av_bsf_list_free(AVBSFList **lst)
406 for (i = 0; i < (*lst)->nb_bsfs; ++i)
407 av_bsf_free(&(*lst)->bsfs[i]);
408 av_free((*lst)->bsfs);
412 int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf)
414 return av_dynarray_add_nofree(&lst->bsfs, &lst->nb_bsfs, bsf);
417 int av_bsf_list_append2(AVBSFList *lst, const char *bsf_name, AVDictionary ** options)
420 const AVBitStreamFilter *filter;
423 filter = av_bsf_get_by_name(bsf_name);
425 return AVERROR_BSF_NOT_FOUND;
427 ret = av_bsf_alloc(filter, &bsf);
432 ret = av_opt_set_dict2(bsf, options, AV_OPT_SEARCH_CHILDREN);
437 ret = av_bsf_list_append(lst, bsf);
446 int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf)
451 if ((*lst)->nb_bsfs == 1) {
452 *bsf = (*lst)->bsfs[0];
453 av_freep(&(*lst)->bsfs);
458 ret = av_bsf_alloc(&ff_list_bsf, bsf);
462 ctx = (*bsf)->priv_data;
464 ctx->bsfs = (*lst)->bsfs;
465 ctx->nb_bsfs = (*lst)->nb_bsfs;
472 static int bsf_parse_single(const char *str, AVBSFList *bsf_lst)
474 char *bsf_name, *bsf_options_str, *buf;
475 AVDictionary *bsf_options = NULL;
478 if (!(buf = av_strdup(str)))
479 return AVERROR(ENOMEM);
481 bsf_name = av_strtok(buf, "=", &bsf_options_str);
483 ret = AVERROR(EINVAL);
487 if (bsf_options_str) {
488 ret = av_dict_parse_string(&bsf_options, bsf_options_str, "=", ":", 0);
493 ret = av_bsf_list_append2(bsf_lst, bsf_name, &bsf_options);
495 av_dict_free(&bsf_options);
501 int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf_lst)
504 char *bsf_str, *buf, *dup, *saveptr;
508 return av_bsf_get_null_filter(bsf_lst);
510 lst = av_bsf_list_alloc();
512 return AVERROR(ENOMEM);
514 if (!(dup = buf = av_strdup(str))) {
515 ret = AVERROR(ENOMEM);
520 bsf_str = av_strtok(buf, ",", &saveptr);
524 ret = bsf_parse_single(bsf_str, lst);
531 ret = av_bsf_list_finalize(&lst, bsf_lst);
534 av_bsf_list_free(&lst);
539 int av_bsf_get_null_filter(AVBSFContext **bsf)
541 return av_bsf_alloc(&ff_list_bsf, bsf);